Glenn's Space: Assembly Language 8086 convert small character to capital

Assembly Language 8086 convert small character to capital

Wednesday, August 1, 2012 Posted by Glenn

;CREATE A PROGRAM THAT WILL ASK FOR A SMALL LETTER
;AND OUTPUT IT IN CAPITAL LETTER
;WWW.GLENNVON.COM
;PROGRAM BY GLENN POSADAS

@pc macro char
mov ah,02h
mov dl,char
int 21h
endm

@ps macro st
mov ah,09h
lea dx,st
int 21h
endm

cseg segment para 'code'
assume cs:cseg;ss:cseg;ds:cseg;es:cseg
org 100h

start: jmp begin

dianacustodio db ?
str1 db 'Input a character: $'
str2 db 10,13,'Output: $'

begin:
mov ax,03h	;clear
int 10h		;clear

@ps str1	;input a char

mov ah,01h	;interrupt for inputing a char
int 21h

mov dianacustodio,al ;put the character from al register to dianacustodio variable

cmp dianacustodio,97	;compare if the character inside the dianacustodio variable is greaterthan or equal to 97(ASCII)
jge covert_now ;if greater than or equal to 97,then jump to convert_now label.

cmp dianacustodio,123
jge exit ;if 123 or greater, terminate the program

cmp dianacustodio,96
jle exit ;exit again if the input is not a small character

convert_now:
sub dianacustodio,32 ;subtract 32 decimal to convert the character to capital
@ps str2
@pc dianacustodio ;then print

exit:

int 20h
cseg ends
end start

additional tags: print the small character into capital letter, conversion of characters in assembly language programming 8086, programming 8086 assembly language conversion of small characters to capital.

Author: Glenn Posadas

20 year old 5th year Computer Engineering Student, a blogger, photographer, programmer, and an electronics hobbyist; a Christian who loves God very much..

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